About 155/70R21 Tires

The 155/70R21 tire size is relatively uncommon and is primarily found on select electric vehicles, most notably the Tesla Model 3 and certain Polestar models that use narrow, tall tires to reduce rolling resistance and improve energy efficiency. This size is specifically engineered for EVs where aerodynamic efficiency and range optimization are prioritized over traditional performance characteristics. Owners of these vehicles have limited cross-compatibility with other tire sizes, making it important to source replacements from suppliers who specialize in EV-specific fitments.

At the budget end, Sailun and Aplus offer affordable options in this size that meet basic performance requirements for everyday urban driving. Mid-range buyers should consider Hankook or Continental, which provide a solid balance of low rolling resistance, wet traction, and longevity well-suited to EV applications. For premium performance, Michelin's e.Primacy and Bridgestone's Ecopia lines are top choices, engineered specifically to maximize range and deliver superior handling for electric vehicles.

Treddur is currently tracking 11 listings for 155/70R21 tires. Prices range from $39.93 to $157.21 depending on brand and retailer.

Because this size is used predominantly on electric vehicles, demand tends to spike in spring and fall as EV owners swap between summer and winter tire sets, so purchasing slightly off-season can yield modest savings. Buying in late winter or mid-summer, when demand is lower, may help consumers secure better pricing or availability.

Due to the specialized and low-volume nature of the 155/70R21 size, prices tend to run higher than more common tire sizes, with limited discounting and fewer competitive options keeping retail prices relatively stable throughout the year.